Least primes using (among other digits) exactly two 2's, zero 0's, one 1's and seven 7's: 12277577777,12277775777,12277787777,12477277777,12527777777, 12577277777,12724777777,12725777777,12727747777,12727775777. There are exactly 1201 such 11d primes.
Четверг, 6 октября 2016, 6:45 +03:00 от Zak Seidov via math-fun <math-fun@mailman.xmission.com>:
First k > 1 such that 2017^k contains exactly n copies of ' 2017' are: 61, 488, 739, 1275, 2673, 2957, 5135, 6651, 4343, 10051, 11273...? Ave, Sum?
Четверг, 6 октября 2016, 5:50 +03:00 от Dan Asimov < dasimov@earthlink.net >:
----- It appears that 2^2017 is the largest power of 2 that does not include the substring 53. -----
ausum
—Dan _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun